Metric Piston Seal Kits — Polypac Precision Sealing Solutions
Metric Piston Seal Kits — Reliable Hydraulic Sealing by Polypac
Polypac's Metric Piston Seal Kits are engineered to provide outstanding sealing performance for hydraulic cylinders across industries. Combining filled PTFE heritage with modern elastomer technology, Polypac offers kits optimized for pressure retention, low friction, and extended service life.
Key Features
Each Metric Piston Seal Kit features precision-manufactured components designed for tight tolerances, minimal extrusion, and low stick-slip behavior. Our kits integrate PTFE-based seals, energizers, and backup rings where required to guarantee stable operation under dynamic piston movement.
Materials & Compatibility
Polypac supplies Metric Piston Seal Kits in a wide range of materials—bronze-filled PTFE, carbon-filled PTFE, graphite PTFE, MoS₂-filled PTFE, glass-filled PTFE, NBR, FKM, EPDM, silicone, and FFKM—so you can match chemical—and temperature—compatibility to your application.
Custom Manufacturing & R&D
With an 8,000 m² production facility (10,000+ m² site) and advanced testing equipment, Polypac develops custom seal profiles and compounds for special working conditions. Since 2008, our collaboration with universities and research institutes drives continuous material innovation and strict quality control.
Applications
Metric Piston Seal Kits from Polypac are ideal for hydraulic cylinders in construction machinery, industrial presses, marine equipment, and mobile hydraulics. Kits are available for metric bore sizes and can be tailored for high-pressure, high-speed, or abrasive environments.
Why Choose Polypac
As a scientific and technical hydraulic seal manufacturer and oil seal supplier, Polypac combines decades of PTFE expertise with elastomer versatility. We provide fast OEM support, precise tolerances, and material traceability—ensuring your Metric Piston Seal Kits meet performance and regulatory expectations.
Ordering & Technical Support
Contact Polypac for quotation, CAD drawings, and sealed sample kits. Our technical team assists with material selection, tolerance recommendations, and field troubleshooting to shorten time-to-market and reduce lifecycle costs.
Metric Piston Seal Kits Display
How do I choose the right material for my sealing application?
Material selection depends on four key factors: Media: What fluid or gas will the seal contact? (e.g., petroleum oil, water, chemicals, steam) Temperature: What is the minimum and maximum operating temperature? Pressure: What is the system's operating pressure? Are there pressure spikes? Application: Is it a static, dynamic, or rotary seal? Example: NBR (Buna-N) is excellent for standard hydraulic oil, while FKM (Viton®) is needed for high temperatures or aggressive chemicals.
When should I use a spring-energized seal instead of a standard elastomeric seal?
Consider a spring-energized seal (e.g., GSF, SPN types) for demanding applications involving: Extreme Temperatures (below -30°C or above +200°C) Aggressive Chemicals that elastomers can't handle Very Low Leakage or "Zero Leakage" requirements Poor Lubricity or dry running conditions The internal spring maintains constant sealing force, compensating for wear and system variables.
What is the purpose of the metal spring in a rotary shaft seal?
The garter spring in a shaft seal (e.g., FSKR, SPGO types) provides a constant radial force on the sealing lip. This ensures consistent contact with the rotating shaft, compensating for minor wear, eccentricity, and vibration to prevent lubricant leakage.
What does "AS568" mean?
AS568 is the Aerospace Standard that defines the dimensions for over 360 standard O-ring sizes. It is the most widely accepted sizing system in North America and globally. An AS568 number (e.g., AS568-214) specifies a precise inside diameter and cross-section.
How important is surface finish on the metal parts that contact the seal?
Extremely important. A rough surface will abrade and wear out the seal quickly, causing leaks. A finish that is too smooth can prevent a lubricating film from forming. A typical recommended surface finish for dynamic applications is 0.2 to 0.8 μm (8-32 μin) Ra.
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